Jack



1 2 4 7 I M M Z M w 0 4 W 5 U .0 1 I July 21, 1925.

G. L. BUTTA JACK Filed Jan. 15, 192

' Giovanni luigi Bufla/ Inventor.

Aiiomeys Patented July 21, 1925.

UNITED STATES GIOVANNI LUIGI BUTTA, OF CONCORD, NEW SOUTH WALES,AUSTRALIA.

JACK.

Application filed January 15, 1925.

T 0 all whom it may concern:

Be it known that GIOVANNI LUIGIYBUTTA, subject of Great Britain,residing at El Retiro, Correy Avenue, Concord, in the State of New South1V ales, Commonwealth of Australia, has invented certain new and usefulImprovements in Jacks, of which the following is a specification.

The invention relates to lifting and lowering jacks of the classcomprising telescoping screws provided with ratchet devices adjacent thepoints where one screw enters another, such devices being oppositelydisposed and reversible so that the jack may be raised or' lowered witha double action whereby loss of motion in manipulating the jack isavoided.

The present invention has for its object to provide an improved jack 'ofthis class in which the construction is simplified and which has theadded advantage that it can be largely manufactured from standardcommercial material. The invention also makes it possible to make allthe screws of the same thread, either all right-handed or all lefthanded.

The invention comprises a screw threaded standard in which is slidablymounted a screw threaded member, a single casing surrounding thejunction of such standard and member and carrying reversible pa-wlswhich respectively engage ratchet teeth on nuts on said standard andmember.

Referring now to the accompanying drawings which illustrate by way ofexample one convenient embodiment of the invention Figure 1 is a centralvertical section of the. improved jack in extended position with certainparts omitted or broken away.

Figure 2 is a central vertical section on a large scale showing the jackin collapsed posit-ion.

Figure 3 is a detail vertical section on a. large scale, and

Figure a is a detail perspective view.

The jack may be provided with any suitable base, that shown in thedrawing being a plate 10 of large diameter having a central boss 11 andbeing axially bored and internally screw threaded at 12 to receive thescrew threaded lower end of the standard 13. The standard 13 is of anysuitable length and externally screw threaded from the top downwardlythroughout the major portion of its length; slidable within Serial No.2,667.

the standard 13 is an externally screw threaded tube 14: of greaterlength than the standard and slidable Within the tube 14: is a screwthreaded rod 15 upon which is a nut 16 and a. bearing block 17 integralwith or secured to its upper end by means of the screw 18. Screwed on tothe standard 13 is a nut 19, another nut 20 being screwed on to the tube14; and interposed between these two nuts and surrounding the standard13 is a tubular distance piece or slidable sleeve 21 that is providedwith a centrally situated annular channel 22. Surrounding the nuts 19and 20 and the slidable sleeve 21 is an, outer casing 23 that iscentrally bored and tapped to receive a screw 24, the end of whichpasses through the casing 23 and lies slidably within the annularchannel 22 in the slidable sleeve 21. The outer casing is also providedwith upper and lower tubular bosses 25 and 26 that form housings fortheir respective spring operated reversible pawls 27 and 28. Centrallyupon the outer casing is a lug 29 that lies in the slotted end 30 of thetelescopic lever 31 and whereby the latter may be pivotally secured at32. The lever 31 is axially bored throughout a portion of its lengthfrom the outer end thereof to slidably receive a rod 33 that has formedor secured to its outer end an internally threaded cap 34 adapted to bescrewed on to the outer end of the lever 31. The lower end of the casingis closed by a washer-like plate 35 that surrounds the standard 13 andis secured to the end of the casing 23 by means of the screws 36. Theupper end of the casing is also closed by a washerlike plate 37 thatsurrounds the tube 14 and is secured to the upper end of the casing bymeans of the screws 38. The nut 16 is seated upon the plate 37 oradjacent thereto when the appliance is in its collapsed position whilethe nut 20 lies immediately below that plate and within the casing 23.Each of the nuts 19 and 20 are provided with ratchet teeth 39 cut upontheir external peripheral face, the respective housings 26 and 25 beingpositioned so that the spring operated pawl carried thereby will engagewith their respective ratchet teeth.

The bosses 25 and 26 are each externally screw threaded to receive aspecially constructed internally screw threaded cap 40.

'Eachpawl 27 and 28 is secured to one end of or is integral with a rodor stem 41 that passes slidably. through a hole bored axially in thetopof the cap 40, the other end of the stem 41 being provided withmilled head or nut 42 by means of which the, pawls may be manuallyadjusted. The cap 40 is diametrically slotted at 43 in order that thepin 44, that passes through and is rigidly secured to the stem 41, maynormally lie therein in order to maintain the pawl in its properposition. The depth of the slot 43 will be such that when the milledhead 42 with its stem '41 and pawl 28 (or 27) is pulled outwardly andgiven a quarter turn the pin 44 will lie upon. the outer extremity ofthe cap 40 transversely across. the slot 43 and the pawl 28 (or 27) bethereby held clear of'the ratchet teeth 89 '(see pawl 27) in Figure 2. Ahelical spring 45 surrounds the stem 41 and is normally held in partialcompression between a shoulder formed by the pawl and the under face ofthe top of the cap 40. Both the paw-ls 27 and 28 have asquareengaging'face and an opposite bevelled orrounded face so thatalternately they will engage their respective ratchet teeth 39 whentheouter casing is turned in one" direction and will move.

radially outward and pass over those ratchet teeth 39 when the casing isturned in the opposite dir ction.

In operating the appliance the ratchet teeth will be set oppositely sothat they will engage their respective ratchets 39 alternately as thelever 31 is operated to rock the casing first in one direction and theno upward travel of .l .L L

.t it rotating upon rhnal slot 46 1S in order to limit the down- -ardmovement of the parts upon the standard 1-3 a screw 51, (Figures 2 and3) may be inserted in the slo 46 and adapted to form a stop for the nut19, the screw 51 b 'n preferably at a point low enough to prevent thetop of the sleeve 21 descending below the pin 49. Upward movement of theparts is arrested when the stop 47 abuts against the outer end of pin49. Upward movement may if desired be stopped ings) which may beinserted in the tube 14 near the bottom of the slot 50 so that as thetube 14 is raised to its fullextent by the rotation of the nut 20 thescrew will abut against the underside of the inner 'end ofthe. pin; 49and prevent any further the upper end ofthe tube 14.

In operatingtheappliance for high lifts the rod 15 may be slid out ofthe tube a suitable distance and the nut 16 screwed down until ,it abutsagainst the top of the tube 14. The pawls 27 and 28 will'now be adjustedand the lever 31 raised toa position radial to the casing 23'and movingit back and forth in a horizontal plane until the desired 'heightisreached. l/Vhen lowering again the pawls' will. be reversed by pullingthe upper and lower heads-42 outwardly and giving them a half turn andthen releasing them' so as to allow the pins 44 to resume their positionwithin the slots 43. By againxoperating the lever-'31 the tube 14 willbe drawn downwardly into the standard 13 while the casing 23 and itsattachments will be'drawn downwardly" upon the standard.

It will be apparent that, when the pin 41 of each pawl is resting on theouter extremity of the ca.p"40,the pawls are held clear of the ratchetteeth, and thusxthe jack may be locked in any desired position.

'l/Vhat I claim is:

1. 4 jack comprising a base-secured to an externally screw threadedtubular standard, an externally .screw threaded member slidable within-said standard, externally toothed nuts on" said standard and member,means for preventing rotation of said member, meansfor maintaining saidtoothed nuts at a constant distance apart, reversely disposed pawls forengaging the teeth on said nuts, a structure carrying both of the pawlsand means for oscillating said structure about the axis of the standard.

2. 'A jack as defined in claim 1' having an externally screw threadedrod slidably IIIOLlIIlJGCl in said member, said rod'having a nut thereonand a thereto. t

3. A jack comprising a base securedto an externally screw threadedtubular standard, an externally screw threaded member slidable withinsaidfs'tandard',externallytoothed bearing block secured 1 I p v nuts onsaid standard and member, a tububy another s crew. (not shown in thedraw lar distance piece or sleeve between saidv nuts and surroundlngsaldstandard, a longitudinalslot in -saidmember, a pin on the block 17secured inany. suitable manner to v standard adapted to slide in saidslot, an external longitudinal slot in said standard, an internal stopon the sleeve and adapted to slide in the slot in the standard wherebysaid externally screw threaded member and distance piece are preventedfrom rotating, a structure carrying the pawls and distance piece andmeans to oscillate said structure about the axis of the standard.

4. A jack as defined in claim 1 in which each reversible anddisengageable pawl is slidably housed in a hollow boss formation securedto or integral with the casing and is provided with a stem that projectsthrough a cap adapted to be screwed on to the boss, a transverse slot inthe cap, a transverse pin rigidly secured to the stem and adaptednormally to lie in the slot in the cap, a spring surrounding the stemand normally held in partial compression between the pawl and the innerface of the cap, a head or nut on the outer extremity of the stemwhereby the pawl may, when required, be pulled clear of the ratchet andturned so that the pin may lie transversely across the slot and the pawlbe thereby temporarily held disengaged from the ratchet.

5. A Jack as defined in claim 1 having a block integral with or securedto a screw threaded rod, a nut on said rod adapted to be seated upon theupper .end of the oscillatory structure for the purpose of adjusting theoperative height of the jack, means for preventing the rod from rotatingwithin the externally screw threaded member and means for limiting theupward movement of the said rod.

6. A jack as defined in claim 1 in which the oscillatory structureconsists of a tubular casing enclosing the externally-toothed nuts andthe distance piece or sleeve and adapted to move longitudinallytherewith, and plates for closing the ends of said casing and whereinthe oscillating means comprises a lever preferably pivotally connectedto the casing whereby the latter may be rotated in opposite directionsto cause the pawls alternately to engage the teeth on said nuts androtate the said nuts in opposite directions.

7 A jack as defined in claim 3 wherein the pawl-carrying structureconsists of a tubular casing and the means for oscillating said casingconsists of a pivotally connected telescopic lever.

In testimony whereof I aflix my signature in presence of two witnesses.

GIOVANNI LUIGI BUTTA.

WVitnesses H. M; MORRIS, L. V. MAGUIRE.

